CN109878370B - Charging method and device for electric vehicle cluster - Google Patents
Charging method and device for electric vehicle cluster Download PDFInfo
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application discloses charging method and device of an electric automobile cluster, wherein the method comprises the following steps: obtaining the latest electricity price information of a time period to be optimized, newly accessed electric vehicle information and a state value function model corresponding to the time period, wherein the electric vehicle information comprises: a charging energy requirement; determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information; determining the charging power of the electric automobile cluster to be charged according to the charging demand and the state value function model based on a charging power calculation formula; the electric automobiles in the electric automobile cluster to be charged are charged according to the charging power, and the technical problems that an existing charging method of the electric automobile cluster is low in calculation efficiency, wrong in calculation result and not real-time enough are solved.
Description
Technical Field
The application belongs to the technical field of electric automobiles, and particularly relates to a charging method and device for an electric automobile cluster.
Background
With the acceleration of social and economic growth, rapid development and upgrade of the automobile industry and increasingly severe global environmental problems, Electric Vehicles (EVs) are widely concerned by countries in the world by virtue of the important characteristics of energy conservation and emission reduction as substitutes of the current traditional fuel automobiles. With the continuous breakthrough of the electric automobile technology, the electric network in China faces the problem of large-scale access of the electric automobile in the future. However, because a large number of electric vehicles are randomly connected to the power grid, the phenomenon of simultaneous connection often occurs, which causes the charging load peak to overlap with the power grid power consumption peak period, and the phenomenon of peak-to-peak addition occurs. Therefore, the method has important significance for orderly regulating and controlling the charging behaviors of a large number of electric automobiles, safely operating the power grid and improving the economic benefit of the power grid.
At present, various power grid companies and research institutions are all researching the regulation and control operation problems of large-scale electric vehicles connected into a power grid, but the following defects still exist:
1. currently, a single electric vehicle is mostly used as a modeling and optimizing unit for a charging model of the electric vehicle, and the method faces the problems of low calculation efficiency and wrong calculation results when large-scale electric vehicles are used;
2. currently, most of research on electric vehicle charging optimization focuses on day-ahead scheduling, and a real-time decision method after large-scale electric vehicle access is lacked.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a charging optimization method for an electric vehicle cluster.
Disclosure of Invention
In view of this, the application provides a charging method and device for an electric vehicle cluster, which are used for charging an electric vehicle cluster and solve the technical problems that the existing charging method for the electric vehicle cluster is low in calculation efficiency, wrong in calculation result and not real-time enough.
The application provides a charging method of an electric automobile cluster in a first aspect, which comprises the following steps:
obtaining the latest electricity price information of a time period to be optimized, newly accessed electric vehicle information and a state value function model corresponding to the time period, wherein the electric vehicle information comprises: a charging energy requirement;
determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information;
determining the charging power of the electric automobile cluster to be charged according to the charging demand and the state value function model based on a charging power calculation formula;
and charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
Preferably, the method further comprises:
acquiring training electricity price information corresponding to a plurality of training time periods and training charging requirements of a training electric automobile cluster;
discretizing the training charging requirement of each training time period according to a discretization formula;
and determining the discretized marginal benefit of each training charging requirement according to a marginal benefit calculation formula and each training electricity price information, and determining a state value function model corresponding to each training time period according to the marginal benefit.
Preferably, the discretization formula is:
where t is the time, B is the number of discretizations, Emax,tAnd Emin,tRespectively an upper bound and a lower bound, R, of the cluster energy track of the electric automobiletFor charging demand, δ RtThe discretized charging demand.
Preferably, the estimation parameters of the state value function model are specifically:
vi(t,b)＝(1-μ)vi-1(t,b)+μci(t,b)，
wherein v isi(t, b) is an estimation parameter of the state value function model in the ith training, and mu is iterationStep size, ciAnd (t, b) is the marginal benefit of the charging requirement of the b-th section of the electric automobile cluster in the ith training.
Preferably, the marginal benefit calculation formula is as follows:
wherein R istFor charging requirements, Ct,bAnd Ct,b+1Respectively, the charging demand is Rt,bAnd Rt,b+1The minimum charging cost of the electric vehicle cluster,
t is the total number of training periods, Δ T is the interval of time, αkElectricity price at time k, PEVLA,tIs the charging power at time t.
Preferably, the charging power calculation formula is specifically:
wherein, ybIs an intermediate variable, v (t, b) is an estimation parameter of a state value function model obtained after training is finished, and v (t, b) ybFor the state value function model, the constraint conditions to be satisfied by each variable are as follows:
wherein E istAnd n is the number of all electric vehicles connected to the power grid at the moment t.
Preferably, the acquiring the latest electricity price information of the time period to be optimized specifically includes:
and acquiring the electricity price information at the starting moment of the time period to be optimized, and taking the electricity price information as the latest electricity price information.
Preferably, the acquiring newly accessed electric vehicle information of the period to be optimized specifically includes:
acquiring newly accessed electric vehicle information at the starting moment of the time period to be optimized, and taking the newly accessed electric vehicle information at the starting moment as the newly accessed electric vehicle information.
Preferably, the determining, according to the newly accessed electric vehicle information, the charging requirement of the electric vehicle cluster to be charged in the period to be optimized specifically includes:
and determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information and the accessed electric automobile information.
This application second aspect provides a charging device of electric automobile cluster, includes:
the obtaining unit is used for obtaining the latest electricity price information of a time period to be optimized, newly accessed electric vehicle information and a state value function model corresponding to the time period, wherein the electric vehicle information comprises: a charging energy requirement;
the charging demand determining unit is used for determining the charging demand of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information;
the charging power determining unit is used for determining the charging power of the electric automobile cluster to be charged according to the charging requirement and the state value function model based on a charging power calculation formula;
and the charging unit is used for charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a charging method of an electric automobile cluster, which comprises the following steps: obtaining the latest electricity price information of a time period to be optimized, newly accessed electric vehicle information and a state value function model corresponding to the time period, wherein the electric vehicle information comprises: a charging energy requirement; determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information; determining the charging power of the electric automobile cluster to be charged according to the charging demand and the state value function model based on a charging power calculation formula; and charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
According to the method, the charging requirement of the electric automobile cluster to be charged in the time period to be optimized is determined according to the electric automobile information newly accessed in the time period to be optimized, the charging power of the electric automobile cluster to be charged is determined according to the latest electricity price information and the charging requirement of the time period to be optimized, and then the electric automobiles in the electric automobile cluster to be charged are charged according to the charging power.
Drawings
Fig. 1 is a schematic flowchart of a charging method for an electric vehicle cluster according to a first embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a charging method for an electric vehicle cluster according to a second embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a charging device of an electric vehicle cluster in an embodiment of the present application.
Detailed Description
The embodiment of the application provides a charging method and a charging device for an electric automobile cluster, which are used for charging the electric automobile cluster and solve the technical problems that the existing charging method for the electric automobile cluster is low in calculation efficiency, wrong in calculation result and not real-time enough.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a charging method of an electric automobile cluster in a first aspect.
Referring to fig. 1, a schematic flow chart of a first embodiment of a charging method for an electric vehicle cluster in an embodiment of the present application includes:
It should be noted that, the latest electricity price information of the time period to be optimized, the newly accessed electric vehicle information, and the state value function model corresponding to the time period are obtained first, where the electric vehicle information includes: charging energy requirements. It can be understood that the time period to be optimized may be set according to requirements, for example, the time period may be one minute, ten minutes, one hour, and the like, and in this embodiment, ten minutes is taken as an example to illustrate, and power rate information within ten minutes, newly-accessed electric vehicle information, and a corresponding state value function model are obtained.
Simultaneously, electric automobile information still includes: departure time, battery capacity, battery charging power limit.
And step 102, determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information.
It should be noted that after the latest electricity price information, the newly accessed electric vehicle information, and the state value function model corresponding to the time period of the time period to be optimized are obtained, the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized is determined according to the newly accessed electric vehicle information. For example, after obtaining the newly-accessed electric vehicle credit in ten minutes in step 101, the charging requirement of the electric vehicle cluster to be charged in the ten minutes is determined.
And 103, determining the charging power of the electric automobile cluster to be charged according to the charging demand and the state value function model based on the charging power calculation formula.
It should be noted that after the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized is determined, the charging power of the electric vehicle cluster to be charged is determined according to the charging requirement and the state value function model based on the charging power calculation formula. After determining the charging requirement within ten minutes, for example, in step 102, the charging power of the ten-minute electric vehicle cluster to be charged may be further determined according to step 103.
And 104, charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
It should be noted that after the charging power of the electric vehicle cluster to be charged is determined, the electric vehicles in the electric vehicle cluster to be charged are charged according to the charging power.
In the embodiment, the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized is determined according to the electric vehicle information newly accessed in the time period to be optimized, the charging power of the electric vehicle cluster to be charged is determined according to the latest electricity price information and the charging requirement of the time period to be optimized, and then the electric vehicles in the electric vehicle cluster to be charged are charged according to the charging power.
The above is a first embodiment of a charging method for an electric vehicle cluster provided in the embodiment of the present application, and the following is a second embodiment of the charging method for an electric vehicle cluster provided in the embodiment of the present application.
Referring to fig. 2, a schematic flow chart of a second embodiment of a charging method for an electric vehicle cluster in the embodiment of the present application includes:
It should be noted that the training electricity price information and the training charging requirement may be generated by a monte carlo method, and it is understood that the monte carlo method belongs to common knowledge of those skilled in the art and is not described herein again.
It should be noted that the discretization formula is:
where t is the time, B is the number of discretizations, Emax,tAnd Emin,tRespectively an upper bound and a lower bound, R, of the cluster energy track of the electric automobiletFor charging demand, δ RtThe discretized charging demand.
And 203, determining the marginal benefit of each training charging requirement after discretization according to a marginal benefit calculation formula and each training electricity price information, and determining a state value function model corresponding to each training time period according to the marginal benefit.
It should be noted that the estimation parameters of the state value function model are specifically:
vi(t,b)＝(1-μ)vi-1(t,b)+μci(t,b)，
wherein v isi(t, b) is an estimation parameter of a state value function model in the ith training, mu is an iteration step length, ciAnd (t, b) is the marginal benefit of the charging requirement of the b-th section of the electric automobile cluster in the ith training.
The marginal benefit calculation formula is as follows:
wherein R istFor charging demand, δ RtFor discretized charging demand, Ct,bAnd Ct,b+1Respectively, the charging demand is Rt,bAnd Rt,b+1The minimum charging cost of the electric vehicle cluster,
t is the total number of training periods, Δ T is the interval of time, αkElectricity price at time k, PEVLA,tThe charging power at the moment t, eta is the charging efficiency of the charging pile, and the value is generally 0.95.
It can be understood that the obtaining of the latest electricity price information of the time period to be optimized specifically includes: and acquiring the electricity price information at the starting moment of the time period to be optimized, and taking the electricity price information as the latest electricity price information.
The method for acquiring the newly accessed electric vehicle information in the time period to be optimized specifically comprises the following steps:
and acquiring newly accessed electric vehicle information at the starting moment of the time period to be optimized, and taking the newly accessed electric vehicle information at the starting moment as the newly accessed electric vehicle information.
And step 205, determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information.
It should be noted that, according to the newly accessed electric vehicle information, determining the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized specifically includes:
and determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information and the accessed electric automobile information.
And step 206, determining the charging power of the electric automobile cluster to be charged according to the charging demand and the state value function model based on the charging power calculation formula.
It should be noted that the charging power calculation formula specifically includes:
wherein, ybIs an intermediate variable, v (t, b) is an estimated value parameter of a state value function model obtained after training is finished, v (t, b)t,b)ybFor the state value function model, the constraint conditions to be satisfied by each variable are as follows:
wherein E istAnd n is the number of all electric vehicles connected to the power grid at the moment t.
And step 207, charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
It should be noted that step 207 is the same as step 104 in the first embodiment, and is not described again here.
Compared with the prior art, the charging method of the electric automobile cluster in the embodiment of the application has the following advantages:
(1) in the embodiment, a large-scale electric automobile is equivalent to an electric automobile cluster, the real-time solution of the charging power of the EV cluster is realized by using the ADP theory, the algorithm is high in calculation speed, the problem of dimension disaster is avoided when the scale of the electric automobile cluster is increased, and the practical application is facilitated.
(2) The embodiment can update the value function estimation parameters by using historical data, and can obtain more accurate real-time decision without predicting the state change of the future system.
(3) The method has strong adaptability to the real-time electricity price and the high randomness of the charging behavior of the electric automobile, and the solution of real-time decision has robustness.
In the embodiment, the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized is determined according to the electric vehicle information newly accessed in the time period to be optimized, the charging power of the electric vehicle cluster to be charged is determined according to the latest electricity price information and the charging requirement of the time period to be optimized, and then the electric vehicles in the electric vehicle cluster to be charged are charged according to the charging power.
The second embodiment of the charging method for an electric vehicle cluster provided in the embodiment of the present application is an application example of the charging device for an electric vehicle cluster provided in the embodiment of the present application.
Referring to fig. 3, in an embodiment of the present application, a schematic structural diagram of a charging device for an electric vehicle cluster includes:
an obtaining unit 301, configured to obtain latest electricity price information of a time period to be optimized, newly accessed electric vehicle information, and a state value function model corresponding to the time period, where the electric vehicle information includes: a charging energy requirement;
the charging demand determining unit 302 is configured to determine, according to the newly accessed electric vehicle information, a charging demand of the electric vehicle cluster to be charged in a time period to be optimized;
the charging power determining unit 303 is configured to determine, based on a charging power calculation formula, charging power of the electric vehicle cluster to be charged according to the charging requirement and the state value function model;
and the charging unit 304 is configured to charge the electric vehicles in the electric vehicle cluster to be charged according to the charging power.
In the embodiment, the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized is determined according to the electric vehicle information newly accessed in the time period to be optimized, the charging power of the electric vehicle cluster to be charged is determined according to the latest electricity price information and the charging requirement of the time period to be optimized, and then the electric vehicles in the electric vehicle cluster to be charged are charged according to the charging power.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the power grid network, the device and the unit to be installed described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another grid network to be installed, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A charging method of an electric automobile cluster is characterized by comprising the following steps:
acquiring training electricity price information corresponding to a plurality of training time periods and training charging requirements of a training electric automobile cluster;
discretizing the training charging requirement of each training time period according to a discretization formula;
determining the discretized marginal benefit of each training charging requirement according to a marginal benefit calculation formula and each training electricity price information, and determining a state value function model corresponding to each training time period according to the marginal benefit;
obtaining the latest electricity price information of a time period to be optimized, newly accessed electric vehicle information and a state value function model corresponding to the time period, wherein the electric vehicle information comprises: a charging energy requirement;
determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information;
determining the charging power of the electric automobile cluster to be charged according to the charging demand and the state value function model based on a charging power calculation formula;
and charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
2. The method of charging an electric vehicle cluster of claim 1, wherein the discretization formula is:
where t is the time, B is the number of discretizations, Emax,tAnd Emin,tRespectively an upper bound and a lower bound, R, of the cluster energy track of the electric automobiletFor charging demand, δ RtThe discretized charging demand.
3. The method according to claim 2, wherein the estimation parameters of the state value function model are specifically:
vi(t,b)＝(1-μ)vi-1(t,b)+μci(t,b)，
wherein v isi(t, b) is an estimation parameter of a state value function model in the ith training, mu is an iteration step length, ciAnd (t, b) is the marginal benefit of the charging requirement of the b-th section of the electric automobile cluster in the ith training.
4. The charging method for electric vehicle cluster as claimed in claim 3, wherein the marginal benefit calculation formula is:
wherein R istFor charging demand, δ RtFor discretized charging demand, Ct,bAnd Ct,b+1Respectively, the charging demand is Rt,bAnd Rt,b+1Time, minimum charge of electric vehicle clusterThe utility model relates to a novel water-saving device,
t is the total number of training periods, Δ T is the interval of time, αkThe electricity price at the moment of k, eta is the charging efficiency of the charging pile, PEVLA,tIs the charging power at time t.
5. The charging method of the electric vehicle cluster according to claim 4, wherein the charging power calculation formula is specifically:
wherein, ybIs an intermediate variable, v (t, b) is an estimation parameter of a state value function model obtained after training is finished, and v (t, b) ybFor the state value function model, the constraint conditions to be satisfied by each variable are as follows:
wherein E istAnd n is the number of all electric vehicles connected to the power grid at the moment t.
6. The charging method for the electric vehicle cluster according to claim 1, wherein the acquiring the latest electricity price information of the time period to be optimized specifically comprises:
and acquiring the electricity price information at the starting moment of the time period to be optimized, and taking the electricity price information as the latest electricity price information.
7. The charging method for the electric vehicle cluster according to claim 1, wherein the acquiring of the newly accessed electric vehicle information in the time period to be optimized specifically comprises:
acquiring newly accessed electric vehicle information at the starting moment of the time period to be optimized, and taking the newly accessed electric vehicle information at the starting moment as the newly accessed electric vehicle information.
8. The method for charging an electric vehicle cluster according to claim 1, wherein the determining, according to the newly accessed electric vehicle information, the charging requirement of the electric vehicle cluster to be charged in the time period to be optimized specifically comprises:
and determining the charging requirement of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information and the accessed electric automobile information.
9. A charging device of an electric vehicle cluster is characterized by comprising:
the first acquisition unit is used for acquiring training electricity price information corresponding to a plurality of training time periods and training charging requirements of a training electric automobile cluster;
the discretization unit is used for discretizing the training charging requirement of each training time interval according to a discretization formula;
the state value function model determining unit is used for determining the marginal benefit of each training charging requirement after discretization according to a marginal benefit calculation formula and each training electricity price information, and determining a state value function model corresponding to each training time period according to the marginal benefit;
the second obtaining unit is used for obtaining the latest electricity price information of a time period to be optimized, newly accessed electric vehicle information and a state value function model corresponding to the time period, wherein the electric vehicle information comprises: a charging energy requirement;
the charging demand determining unit is used for determining the charging demand of the electric automobile cluster to be charged in the time period to be optimized according to the newly accessed electric automobile information;
the charging power determining unit is used for determining the charging power of the electric automobile cluster to be charged according to the charging requirement and the state value function model based on a charging power calculation formula;
and the charging unit is used for charging the electric automobiles in the electric automobile cluster to be charged according to the charging power.
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